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Cement

About: Cement is a research topic. Over the lifetime, 68440 publications have been published within this topic receiving 829356 citations.


Papers
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Journal ArticleDOI
TL;DR: In this paper, the compressive strength, degree of pozzolanic reaction, and porosity of zeolite modified cement pastes were compared with those obtained from similar blended pastes prepared with silica fume and fly ash replacements.

238 citations

Journal ArticleDOI
TL;DR: In this paper, a linear relationship between the fractional change in resistivity and compressive strain was observed for cement-based composites containing a large amount of carbon black (CB), suggesting that this kind of composite was a promising candidate for strain sensors used in concrete structures.
Abstract: This paper investigates the strain sensing properties of carbon black (CB)-filled cement-based composites which were prepared with 120 nm CB. A linear relationship between the fractional change in resistivity and compressive strain was observed for cement-based composites containing a large amount of CB, suggesting that this kind of composite was a promising candidate for strain sensors used in concrete structures. Tunneling effect theory and percolation theory are employed to interpret the conductivity and electromechanical properties of CB-filled cement-based composites.

238 citations

Journal ArticleDOI
TL;DR: Results suggest that significant degradation due to matrix diffusion of CO2 in intact Class H neat hydrated cement is unlikely on time scales of decades.
Abstract: Experiments were conducted to study the degradation of hardened cement paste due to exposure to CO2 and brine under geologic sequestration conditions (T = 50 °C and 30.3 MPa). The goal was to determine the rate of reaction of hydrated cement exposed to supercritical CO2 and to CO2-saturated brine to assess the potential impact of degradation in existing wells on CO2 storage integrity. Two different forms of chemical alteration were observed. The supercritical CO2 alteration of cement was similar in process to cement in contact with atmospheric CO2 (ordinary carbonation), while alteration of cement exposed to CO2-saturated brine was typical of acid attack on cement. Extrapolation of the hydrated cement alteration rate measured for 1 year indicates a penetration depth range of 1.00 ± 0.07 mm for the CO2-saturated brine and 1.68 ± 0.24 mm for the supercritical CO2 after 30 years. These penetration depths are consistent with observations of field samples from an enhanced oil recovery site after 30 years of ex...

238 citations

Journal ArticleDOI
TL;DR: In the literature, shear thickening occurs when suspensions have a high solid concentration and when repulsive interactions are predominant as discussed by the authors, and it can be achieved in cement pastes owing to the dispersing action of superplasticizer.

237 citations

Journal ArticleDOI
TL;DR: In this paper, the results of an experimental study carried out to investigate fresh and hardened properties of alkali-activated fly ash/slag pastes with superplasticizers were presented.

237 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20248
20234,852
20228,607
20213,442
20203,929
20194,260